A hard fork that would increase the coin supply.
There's no reason to ever increase the coin supply. Not-even-one. The system works currently with
this circulating supply and any change in it would be consensus-ly irrational.
As I said before, there'll never be a user who'll support this because it'll instantly reduce their wealth power. One may fork the code and increase the supply; no one will follow other than those who aren't using Bitcoin and want to have profit.
Under the current situation, no, but fee revenue for the miners is currently going low, and might keep going lower. For long-term security, and the system's sustainability, block rewards + fee revenue must be high. Developers can't control fee revenues per block, but they can propose for an extension of the block reward.